Nonferrous alloy



Patented Oct. '12, 1926.

[UNITED STATES PATENT. OFF-ICE.

GNOR TO -HAYNES STELLITE OOIIANY; A CORPORATION OF INDIANA.

nomrnnnous ALLoY.

l lo Drawing. Application illed January The present invention relates to alloys comprising cobalt, one or more metals of the I Alloys of chromium group, and boron, the latter in the proportion of at least 0.40% by weight. thetype comprising cobalt and a metal or metals of the chromium .are disclosed in S. patents to 873,745, 1,057,423 and 1,057,828, and has heretofore been introduced in very aynes boron l proportion into such alloys. I have now discovered that the introduction of boron in larger proportion, as above indicated, ex erts a highly favorable influence in the properties of the alloy, especially for lathe tool purposes. Alloys which I have found to possess cutting ualities, when used for lathe tools and the li e, far superior to those of the heretofore known alloys of the cobalt-chromium tungsten type have been prepared within the range set forth in the following tablei Per cent. Tungsten 20 to 30 Chromium s.' 20 to 30 Carbon 0.75to 2.40 Boron 0.40 to 2.00 Iron 0.0 to 5.00 Silicon. 0.0 to 1.00 Cobalt Balance.

It :is tobe understood that iron and silicon are present substantially as impurities and are not. necessary eleinents in the composition.-

It is further considered tov be within the scope of .my invention to add amounts of boron greater than 0.40%, not only to alloys such as those covered bythe range specified -in the aboveftable but s also to any alloy of the cobalt-chromium-tungsten type, with or f "without other components.

ly cobalt.

Alloys which have shown exceptionally cutting qualities when tested on semisteel have been made. with a tungsten content of substantially 25%, chromiu'm sub-- stantially 25%, boron 0.40% to 0.60%, carbon 0.75% to 2.40%,

It has also beenfound' that when the boron content is raised to between 0.80% and 1,80% and the carbon is held between .75% and 2.40%, the properties of the metal change, the metal becoming slightly weaker but exhibiting improved cutting qualities on both steel and semi-steel. From these investigasmall the balance principal- 10, 1025., Serial m; 1,630.

tions it on steel tent-is not-more than 0.50% above theboron content, although good tools may be made throughout the range indicated. When the boron andv carbon are both close to the upper limit the metal is somewhat brittle. of comparatively high strength may be made within the range boron .80% and 1.10%, carbon 1.30% and 2.00%.

An alloy containing 1.20% boron and 1.15% carbon has shown particularly good properties when cutting steel and semistee while an alloy containing .54% boron and 1.38% carbon has shown exceptionally good qualities when used on semi-steel.

Obviously some modifications of my inventionapherein described maybe made without departing from the spirit thereof and I do not wish to be limited to the exact composition in all of its details as herein described.

All the alloys comprised within the invention are suitablefor speed cutting of cast iron, steel, and semi- Tools tools for the highi steel, though they are also useful for other I pur oses. i1se in the same sense as in the common ex.-

gression high-speed steel,

itions of such severity that ordinary carbon would be softened steels subjected to them in the cutting and 'bly the heat generated. t us become useless.

uHaving thus described my invention, whatI claim 1. A non-ferrous alloy suitable for tools for the high-speed cutting of" cast iron which contains at least 15% of chromium, at least 10% of another metal of the chro- 'mium group and at least 0.40% of boron, with the balance principally cobalt.

2. A non-ferrous alloy suitable for tools for the high-speed cutting of cast iron which contains at. least. 15% of chromium, at least 10% of tungsten and at least 0.40% of boron, with the balance principally cobalt.

3. A; non-ferrous alloy suitable for tools for the high-speed cutting of cast iron which contains at least 15% of chromium, at least 10% of tungsten, at least 0.75% of carbon and at least 0.40% of boron, with the balance Xrincipally cobalt.

4. non-ferrous alloy suitable for tools for the high-speed cutting of cast iron which contains at least 15%of chromium,

The term high-speed is here and imports con- 1 20% to 30% of tungsten and at least 0.40% of boron, with the balance principally cobalt.

5. A non-ferrous alloy suitable for tools for the high-speed cutting of cast iron which contains 20% to 30% of chromium, 20% to 30% of tun sten and at least 0.40% of boron, with the balance principally cobalt.

0. An alloy composed of 20% to 30% chromium, 20% to 30% tungsten, 0.40% to 2.00% boron, 0.75% to 2.40% carbon, with the balance principally cobalt.

7. An alloy composed of 20% to 30% chromium, 20% to 30% of another metal of the chromium group, 0.40% to 2.00% boron, and 0.75% to 2.40% carbon, with the balance principally cobalt.

8. A machine cutting tool composed of a self-hardening non-ferrous alloy containing at least of chromium, at least 10% of another metal of the chromium group and at least 0.40% of boron, with the balance principally cobalt.

9. A machine cutting tool composed of a. self-hardening non-ferrous alloy containing at least 15% of chromium, at least 10% of tungsten and at least 0.40% of boron, with the balance principally cobalt.

10. A machine cutting tool composed of a self-hardening non-ferrous alloy containing at least 15% of chromium, at least 10% of tungsten, at least 0.75% of carbon and at least 0.40% of boron, with the balance principally cobalt.

11. A machine cutting tool composed of a self-hardening non-ferrous alloy containing at least 15% of chromium, to 30% of tungsten and at least 0.40% of boron, with the balance principally cobalt. Y

12. A machine cutting tool composed of a self-hardening nonferrous alloy containing 20% to 30% of chromium, 20% to 30% of tungsten and at least 0.40% of boron, with the balance principally cobalt.

In testimony whereof, I afiix my signature.

' WILLIAM' A. WISSLER. 

